Piston-ring.



E. C. BRANDUM.

- PISTON RING.

, APPLICATION FILED APR. 14. 1917.

1,251,630. Patented Jan. 1, 1918.

anuemtoz 18 I9 EMMETCEBRHNDUM 7 within the S0 UNITED STATES PATENT OFFICE.

EMMET o. BRANDUM, or FnAzEE, muse, rrs'romnn've.

To all whom it may concern:

Be it known that I, EMMET C. BRANDUM, a citizen of the United States, residing at Frazee, in thecounty of Becker and State of Minnesota, have invented certain new and useful Improvements in Piston-Rings, of which the following isa specification, reference being bad to the accompanying drawings.

This invention relates to pistons, and particularly to piston rings therefor.

The general object of my invention is to provide a piston ring of very simple construction, and formed of two sections, each ofsaid. sections being split, and provide means whereby the two sections of the piston ring are so disposed that the splits in the sections will not coincide andprovide means for holding the sections in the relation, thereby securing a more uniform wear on the piston rings and on the wall of the cylinder, and further securing a better fit between the piston rings and the wall of theicylinder.

A further object i to provide a construc tion of this character in which the compound piston ring formed of the two sec-- tions, as heretofore described, may rotate tions will be held from such rotation and the splits in the sectionswill' break joints with each other. 1

A further object is to rovide a piston ring of this character in w ich the sections are held from relative rotation, without the use of dolly pins, or like devices.

A further ob ect is to provide I piston 1 rings, which are so constructed as to retain compression in an internal combustion engine better than ordinary piston rings will do.

Other objects will appear in thecours'e of the followin description.

My invention is illustrated in the accompany'ing drawings wherein Fi re 1 is a fragmentary vertical sectiona view through a piston provided with my improved piston rings' h Fig. 2 is a perspective view of one of the ririg sections; a

ig. 3 is a perspective view of a coacting migsection; 1g. 4 is a fragmental perspective view 7 betweenone of the ring sections.

Referring'to the drawings, it will be seen that my piston ring consists of two sections Specification of Letters Patent.

Application filed April 14, 1917. Serial No. 162,098.

piston ring groove, but the sec-- Patented an. 1, 1918.

10 and 11. One of these sections, as for instance, the section 10 is provided at one margin with an inwardly projecting flange 12, while the other section, as for instance the section 11, is' provided at its opposite margin with an'outwardly projecting flange 13. Thus the section 10, for instance, fits over and surrounds the section 11 and abuts against the inner face of the flange 13, while the inner end of the section 11 abuts against the inner face of the flange 12. It will, of

course, be understood that the outer faces of the two sections are flush with each other and the inner faces of the .two sections are flush, and that both of said sections are made of resilient metal, in the usual manner of piston rings, and fit within a piston ring groove 14 in the piston 15 in the usual manner. 1

The section 11 is split at one. oint, as at 16, this split extending downward from the upper edge to the lower edge of the section 11, but not extending through the flange 13. The flange 1 3 is split, or has an inwardly extending kerf at 17, which extends inward to a point in line with the outer face of the body 11, that portion of the inwardly extending flange 13 between the kerf or split 17 and the kerfor split 16 being cutaway from the body of the section b a-circqm ferentially extending kerf'l8, t us leavmg the flange formed with a tongue overlaps the end ofthe section 11 the-split 17 in the flange is out of allnement with the split or kerf 16 of the body of the section. v h

The section 10 is constructed in the same manner. The bod of the section is s lit, as

at 16, the flange 15 split as at 17 an there is a kerf 18 which extends circumferennally between the flange 12 and the body of the section 10.

section, as or instance the sectishn 10, with the 111 20, which extends from the flangeslQ and w ich is adaptedto engage 1n the recem 19.- When the lug 20 is in engagement with the recess 19 the sectionsare sq heldthdt 19, which soithatcal the split 16 of one section will be in diametrically opposite relation withthe split 16 of the other section and the split 17 of one flange will e; in diametri al y car l tion with the split 17 a of the other flange.

, This prevents any relative rotation of the ring sections upon each other and allows of a more equal expansion of the rings than would be possible where the splits or kerfs, either intentionally or accidentally, come in alinement or in contiguity.

.A a consequence, of providing a piston ring in two sections, the splits of which are held in diametrically opposite relation, the outward pressure of the rings is more uniform and this prevents the piston from slapping. Furthermore, the sections can be more readily tensioned than where the piston ring is formed in one piece and again tion having an outwardly extending marginal flange, the other having an inwardly extending marginal flange, the body of one section having sliding engagement over the body of the other section, with the flanges abutting against the adjacent ends of said body portions, the flanges on each section being split at a distance remote from the split in the body of the section and there being a kerf extending from the split in the body of the section for a distancealong the flange to the split in the flange, to thereby provide a tongue on the flange extending over the body of the section, and means on the sections holding them from relative ro-' tation.

2. As an article of manufacture, a piston rmg made in-two mating annular sections,

each section being split at one point, one section having an outwardly extending marginal flange, the other having an inwardly extending marginal flange, the body of one section having sliding engagement over the body of the other section, with the flanges abutting against the adjacent ends of said body portion, the flanges on each section being split at a distance remote from the split in the body of the section, and there being a kerf extendin from the split in the body of the section %or a distance along the flange to the split in the flange to thereby provide a tongue on the flange extending over the body of the section, and means on the sections holding the sections in such relation that the splits in the bodies of the sections and in the flanges are diametrically opposite.

3. A piston havin a piston ring groove, and a piston ring and composed of two mating sections, each of said sections being formed with a body portion and a flange, the body portion of one section fitting over and having sliding engagement with the body portion of the other section, each of said sections being split at one point and each flange being split at a point remote from the split in the body of the section and being connected to said last named split by a kerf extending between the flange and the body of the section to thereby provide a lapped joint in each section, one of the sections being provided with a lug and the other with a recess into which the lug engages, whereby to hold these recesses with their split point in diametrically opposite relation.

In testimony whereof I hereunto affix my I signature in the presence of two witnesses.

EMMET G. BRANDUM.

Witnesses:

' J. H. SCHNEIDER, H. DmKMANN.

isposed in said groove 

